1. Department of Molecular Microbiology and Immunology, University of Southern California, Keck School of Medicine, Los Angeles, California, USA
2. Department of Biological Sciences, Purdue University, West Lafayette, Indiana, USA
3. Instituto de Biotecnología, Universidad Nacional Autónoma de México, Cuernavaca, Morelos, Mexico
4. Laboratory of Virology and Infectious Disease, The Rockefeller University, New York, New York, USA